We look at the division of 312603 by 73 
We want to divide 312603 by 73.

Step 1:
73 goes into 3 0 times with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Take the next digit (1) from the dividend and append it to 3, then repeat: 31 / 73

Going ahead to step 2:
73 can be fit into 31 0 times, resulting in a remainder of 31.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 31, we get 31.
Grab the next digit (2) from the dividend, add it to 31, then carry on: 312 / 73

Moving on to step 3:
73 goes into 312 4 times with a remainder of 20.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
Subtract 292 from 312 to get 20.
Include the next digit (6) from the dividend after 20, then repeat: 206 / 73

On to step 4:
206 divided by 73 is 2 with a remainder of 60.
The next digit of our result is 2. 
Result so far: 42.0
The remainder is 60 after subtracting 146 from 206.
Grab the next digit (0) from the dividend, add it to 60, then carry on: 600 / 73

Let's proceed to step 5:
The number 73 fits into 600 8 times, leaving a remainder of 16.
Put 8 as the next digit of the answer. 
Result so far: 428.0
Deduct 584 from 600 and we're left with 16.
Include the next digit (3) from the dividend after 16, then repeat: 163 / 73

Step 6:
The number 73 fits into 163 2 times, leaving a remainder of 17.
Write down 2 as next digit of the result. 
Result so far: 4282.0
If we take 146 away from 163, we end up with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

On to step 7:
170 divided by 73 is 2 with a remainder of 24.
Record the quotient 2 as the next digit in the result. 
Result so far: 4282.2
If we take 146 away from 170, we end up with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Step 8:
When dividing 240 by 73, we get 3 with a remainder of 21.
The number 3 becomes the next digit in our result. 
Result so far: 4282.23
Subtract 219 from 240 to get 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Moving on to step 9:
When dividing 210 by 73, we get 2 with a remainder of 64.
The next digit of our result is 2. 
Result so far: 4282.232
Deduct 146 from 210 and we're left with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Step 10:
When dividing 640 by 73, we get 8 with a remainder of 56.
The number 8 becomes the next digit in our result. 
Result so far: 4282.2328
If we take 584 away from 640, we end up with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Let's proceed to step 11:
When dividing 560 by 73, we get 7 with a remainder of 49.
Write down 7 as next digit of the result. 
Result so far: 4282.23287
Subtract 511 from 560 to get 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Advancing to step 12:
73 goes into 490 6 times with a remainder of 52.
The next digit of our result is 6. 
Result so far: 4282.232876
Deduct 438 from 490 and we're left with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Step 13:
73 goes into 520 7 times with a remainder of 9.
Put 7 as the next digit of the answer. 
Result so far: 4282.2328767
The remainder is 9 after subtracting 511 from 520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 14:
73 can be fit into 90 1 times, resulting in a remainder of 17.
The number 1 becomes the next digit in our result. 
Result so far: 4282.23287671
If we subtract 73 from 90, we get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

After the division, we end up with 4282.23287671 and a remainder of 1.7e-08.